cellular-infrastructure
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cellmgr-ng
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patching: Get the struct ss7_application down to the patching routine

zecke/m3ua
Holger Hans Peter Freyther 2013-05-13 18:18:02 +02:00
parent 6553f1b5e9
commit b566c79d82
4 changed files with 23 additions and 12 deletions
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4
include/bss_patch.h
View File

@ -36,6 +36,8 @@
#define BSS_DIR_MSC 2
#define BSS_DIR_ANY (BSS_DIR_MSC | BSS_DIR_BSC)
struct ss7_application;
/**
* Error is < 0
* Success is == 0
@ -43,7 +45,7 @@
*
* Direction...
*/
int bss_patch_filter_msg(struct msgb *msg, struct sccp_parse_result *result, int dir);
int bss_patch_filter_msg(struct ss7_application *app, struct msgb *msg, struct sccp_parse_result *result, int dir);
/*
* Copy inpt->l2h to target->l2h but rewrite the SCCP header on the way

14
src/bss_patch.c
View File

@ -34,7 +34,7 @@
#include <arpa/inet.h>
static int handle_bss_mgmt(struct msgb *msg, struct sccp_parse_result *sccp);
static int handle_bss_mgmt(struct ss7_application *, struct msgb *msg, struct sccp_parse_result *sccp);
static int handle_bss_dtap(struct msgb *msg, struct sccp_parse_result *sccp, int dir);
static void patch_ass_rqst(struct msgb *msg, int length)
@ -66,7 +66,7 @@ static void patch_ass_rqst(struct msgb *msg, int length)
}
}
static void patch_ass_cmpl(struct msgb *msg, int length)
static void patch_ass_cmpl(struct ss7_application *app, struct msgb *msg, int length)
{
struct tlv_parsed tp;
uint8_t *data;
@ -103,7 +103,8 @@ static void patch_ass_cmpl(struct msgb *msg, int length)
}
}
int bss_patch_filter_msg(struct msgb *msg, struct sccp_parse_result *sccp, int dir)
int bss_patch_filter_msg(struct ss7_application *app, struct msgb *msg,
struct sccp_parse_result *sccp, int dir)
{
int type;
memset(sccp, 0, sizeof(*sccp));
@ -145,7 +146,7 @@ int bss_patch_filter_msg(struct msgb *msg, struct sccp_parse_result *sccp, int d
}
if (msg->l3h[0] == BSSAP_MSG_BSS_MANAGEMENT)
return handle_bss_mgmt(msg, sccp);
return handle_bss_mgmt(app, msg, sccp);
if (msg->l3h[0] == BSSAP_MSG_DTAP)
return handle_bss_dtap(msg, sccp, dir);
@ -153,7 +154,8 @@ int bss_patch_filter_msg(struct msgb *msg, struct sccp_parse_result *sccp, int d
return -1;
}
static int handle_bss_mgmt(struct msgb *msg, struct sccp_parse_result *sccp)
static int handle_bss_mgmt(struct ss7_application *app, struct msgb *msg,
struct sccp_parse_result *sccp)
{
switch (msg->l3h[2]) {
case BSS_MAP_MSG_ASSIGMENT_RQST:
@ -162,7 +164,7 @@ static int handle_bss_mgmt(struct msgb *msg, struct sccp_parse_result *sccp)
break;
case BSS_MAP_MSG_ASSIGMENT_COMPLETE:
msg->l3h = &msg->l3h[2];
patch_ass_cmpl(msg, sccp->data_len - 2);
patch_ass_cmpl(app, msg, sccp->data_len - 2);
break;
case BSS_MAP_MSG_RESET:
return BSS_FILTER_RESET;

4
src/sccp_state.c
View File

@ -84,7 +84,7 @@ void app_forward_sccp(struct ss7_application *app, struct msgb *_msg, int sls)
return;
}
rc = bss_patch_filter_msg(_msg, &result, BSS_DIR_MSC);
rc = bss_patch_filter_msg(app, _msg, &result, BSS_DIR_MSC);
if (rc == BSS_FILTER_RESET) {
LOGP(DMSC, LOGL_NOTICE, "Filtering BSS Reset from the BSC\n");
msc_mgcp_reset(msc);
@ -562,7 +562,7 @@ void msc_dispatch_sccp(struct msc_connection *msc, struct msgb *msg)
struct sccp_parse_result result;
int rc;
rc = bss_patch_filter_msg(msg, &result, BSS_DIR_BSC);
rc = bss_patch_filter_msg(msc->app, msg, &result, BSS_DIR_BSC);
if (rc == BSS_FILTER_RESET_ACK) {
LOGP(DMSC, LOGL_NOTICE, "Filtering reset ack from the MSC\n");

13
tests/patching/patching_test.c
View File

@ -1,6 +1,7 @@
#include <bss_patch.h>
#include <cellmgr_debug.h>
#include <ss7_application.h>
#include <osmocom/core/application.h>
#include <osmocom/core/utils.h>
@ -243,6 +244,9 @@ static void test_patch_filter(void)
{
int i;
struct ss7_application app;
memset(&app, 0, sizeof(app));
printf("Testing patching of GSM messages to the MSC.\n");
for (i = 0; i < sizeof(results)/sizeof(results[0]); ++i) {
@ -254,7 +258,7 @@ static void test_patch_filter(void)
msgb_put(msg, 1);
msg->l2h = msgb_put(msg, results[i].inp_len);
memcpy(msg->l2h, results[i].input, msgb_l2len(msg));
rc = bss_patch_filter_msg(msg, &result, BSS_DIR_ANY);
rc = bss_patch_filter_msg(&app, msg, &result, BSS_DIR_ANY);
if (memcmp(msg->l2h, results[i].expected, results[i].exp_len) != 0) {
printf("Failed to patch the packet.\n");
@ -273,6 +277,9 @@ static void test_rewrite_msc(void)
{
int i;
struct ss7_application app;
memset(&app, 0, sizeof(app));
printf("Testing rewriting the SCCP header.\n");
for (i = 0; i < sizeof(rewrite_results_to_msc)/sizeof(rewrite_results_to_msc[0]); ++i) {
struct sccp_parse_result result;
@ -286,7 +293,7 @@ static void test_rewrite_msc(void)
inp->l2h = msgb_put(inp, rewrite_results_to_msc[i].inp_len);
memcpy(inp->l2h, rewrite_results_to_msc[i].input, msgb_l2len(inp));
rc = bss_patch_filter_msg(inp, &result, BSS_DIR_MSC);
rc = bss_patch_filter_msg(&app, inp, &result, BSS_DIR_MSC);
if (rc < 0) {
printf("Failed to parse header msg: %d\n", i);
abort();
@ -295,7 +302,7 @@ static void test_rewrite_msc(void)
bss_rewrite_header_for_msc(rc, outp, inp, &result);
memset(&result, 0, sizeof(result));
rc = bss_patch_filter_msg(outp, &result, BSS_DIR_MSC);
rc = bss_patch_filter_msg(&app, outp, &result, BSS_DIR_MSC);
if (rc < 0) {
printf("Patched message doesn't work: %d\n", i);
printf("hex: %s\n", osmo_hexdump(outp->l2h, msgb_l2len(outp)));